Diaphragm for electrolytical and electro-osmotical purposes.



one matenal onl BOTHO SGHWERIN, 0F FBANKFORT-ON-THE-MEIR', GERMANY, ASSIGNOR GESELL- SCHAFT FUR ELEKTRO'OSMOSE M. B. EL, 01 FBANKFQBT-QN- THE-MAIN, GERMANY,

A CORPORATION.

DIAPHRAGM FOR ELECTROLYTICAL AND ELEC'I'BO-DSMOTICAL FURPOSES.

80 Drawing.

To all whom it may concern: Be it known that I, Bo'rno SCHWERIN, a subject of the German Emperor, and residing at Frankfort-on-the-Main, Germany, have invented certain new and useful-Imrovements in Diaphragms for Electrolytical and Electro-Osmotical Purposes, of which the following is a specification. My invention relates to improvements in diaphragms for electrolytical and electroosmotical purposes. X

The diaphragms hitherto used are made of For example, in the application Serial 0. 703473 I have describedv a diaphragm for electrolytical and electroosmotical purposes comprising a'molded article-of carborundum in a porous, coherent form, substantially free from impurities and binding media, which can. be used for elec trol tical purposes, in which case at one side of t e diaphragm there may be .an acid and -at the opposite side an alkaline electrolyte.

Furthermore such diaphragm ma be used for treating colloidal, soluble or nely subdivided matter and especially for the separation of adsorbed substances from the adsorbents by means of electro-osmosis according to the method described in my Spanish Patent No. 53,607.

I have found that for many electrolytical .and electro-osmoti cal purposes it is preferable to use diaphragms consisting of two or more materials. By using such diaphragms in the electro-osmotical process for separating of adsorbed substances from the adsorbents, there may be obtained a fractionation of the substances to be separated according to their degree of potential, by suitable selection of the materials-used for the diaphragms.

The nature of the diaphragm may vary in respect to its lpotential according to the material from w ich it is made. For example adiaphragm' made of alumina (corundum) is electropositive, v arded as negative, While one of carborun um is {also electronegativebut less strongly Specification of Letters ram.

oneof silicamay be re-,

Patented Jan. 1.191s.

' Application filed January a, 1913. Serial No. 0,260.

so than one of silica. I have found, that any desired degree of potential for the'diaphragm, even a zero potential as compared with Water, may be obtained by making the diaphragm of a mixture of different substances.

By using a diaphragm consisting for example of a mixture of carborundum and corundum, it is possible to separate tungsten as a tungstate in a pure state from the raw material.

In a vessel filled with distilled water, a diaphragm formed from a mixture of carborundum and emery (corundum) is placed, and around this cell a cathode of platinum wire is firmly fastened. In the cell, a diaphragm of aluminum oxid having a positive polarity is placed and the cell filled with distilled water. This cell contains the anode. If a colloidal solution of tungsten metalis placed in the cell formed of carborundum and emery, and the electric circuit is closed the alkaline particles will pass through the 1. A diaphragm for electrolytical and diaphragm last mentioned into the cathode electro-osmotic purposes comprising a molded article of carborundum and corundum in a porous, coherent form, substantially free from impurities and oxidation products.

2. A diaphragm for electrolytical and electro-osmotic purposes comprising a molded article of carborundum and corundum made up of particles of a colloidal nature in a porous coherent and refractory form, substantially free from impurities and binding" media.

In testimony whereof I afliX my signature in presence of two witnesses.

' BOTHO SCHVVERIN;

Witnesses:

JEAN GRUND, CARL GRUND. 

